The Laigin, modern spelling Laighin (in Irish pronounced as /ˈl̪ˠəinʲ/), were a Gaelic population group of early Ireland. They gave their name to the Kingdom of Leinster, which in the medieval era was known in Irish as Cóiced Laigen, meaning "Fifth/province of the Leinstermen" (Modern Irish Cúige Laighean), where their descendants ruled till the 17th century. Their territory, located in south-east Ireland, is thought to have once extended from the River Shannon to the River Boyne. The surnames of those descended from the Laigin are still counted amongst the most numerous in Ireland.
Laigin is a plural noun, indicating an ethnonym rather than a geographic term, but the Irish system of naming territories meant that an area tended to be named after an apical ancestor figure even when the ruling dynasty had no links to that figure. The origin of their name is uncertain; however, it is traditionally assumed to derive from the Irish word Irish, Old (to 900);: láigen, meaning 'a spear'. Early texts use the names Laigen and Gaileoin interchangeably.[1]
The Laigin claimed descent from King Labraid Loingsech. Modern historians suggest, on the basis of Irish traditions and related place names, that the Laigin were a group of invaders from Gaul or Britain, who arrived no later than the 6th century BC, and were later incorporated into the medieval genealogical scheme which made all the ruling groups of early Ireland descend from Míl Espáine. Placenames also suggest they once had a presence in north Munster and in Connacht.[2]
One archaic poem, possibly dating from about 600 AD, reads as follows:
In the saga, Orgain Denna Ríg (The Destruction of Dind Ríg), Labraid Loingsech is exiled when his granduncle Cobhtach Coel usurps the kingship, however, he subsequently returns from abroad with an army of spearmen (Laigin) and takes his kingship by burning the citadel of Dind Ríg to the ground with the usurper and all his retinue inside.
The saga ends with:
So then Cobthach Coel is there destroyed, with seven hundred followers and thirty kings around him, on the eve of great Christmas precisely. Hence is said: Three hundred years—victorious reckoning—before Christ's birth, a holy conception, it was not fraternal, it was evil—(Loegaire) Lorc was slain by Cobthach Coel. Cobthach Coel with thirty kings, Labraid ... slew him (Lugaid). Loegaires grandson from the main, in Dind Ríg the host was slain. And 'tis of this that Ferchertne the poet said: "Dind Ríg, which had been Tuaim Tenbath," etc. i.e. Máin Ollam he was at first, Labraid Moen afterwards, but Labraid the Exile, since he went into exile, when he gained a realm as far as the Ictian Sea, and brought the many foreigners with him (to Ireland), to wit, two thousand and two hundred foreigners with broad lances in their hands, from which the Laigin (Leinstermen) are so called.[3]
Archaic poems found in medieval genealogical texts distinguish three groups making up the Laigin: the Laigin proper, the Gaileóin, and the Fir Domnann. The latter are suggested to be related to the British Dumnonii.[4]
Amongst others, some of the dynasties that claimed to belong to the Laigin include: Uí Failge, Uí Bairrche, Uí Dúnlainge, Uí Ceinnselaig, Uí Garrchon, and the Uí Máil.
In the legendary tales of the Ulster Cycle, the king of the Connachta, Ailill mac Máta, is said to belong to the Laigin. This is thought by Byrne (2001) to be related to a possible early domination of the province of Connacht by peoples related to the Laigin, the Fir Domnann and the Gamanrad.